Finding the Fourth Proportional to 76,118.13, 105,043.20 and 42,128.94

Step by Step Solution

1. Step 1: Write the proportion equation
   76,118.13 : 105,043.20 = 42,128.94 : x
2. Step 2: Convert to fraction form
   76,118.13/105,043.20 = 42,128.94/x
3. Step 3: Cross multiply
   76,118.13x = 105,043.20 × 42,128.94
4. Step 4: Simplify right side
   76,118.13x = 4,425,358,670.21
5. Step 5: Solve for x
   x = 4,425,358,670.21/76,118.13
6. Step 6: Final answer
   x = 58,138.04